The difference between AA EXP and AS 100K is that AA has many flights with 4,000+ mile stage lengths; AS has none over 3K to my knowledge. While the 50% bonus makes it fairly straightforward this year, 100K on AS metal will be a lot harder than 100K on AA metal for those of us who have a mix of domestic and international travel. Sure, partners qualify, but the difference is I can use SWUs on AA metal as an EXP (work only pays for coach); GGUs aren't going to get me into lay-flats on BA or CX.

I was planning to move my "primary" airline from AA to AS, but if AS top tier requires the same qualification as AA, AA is back to the primary slot for me--and I presume many like me for whom AS cannot serve a large fraction of my destinations on their own metal.